Rotary cutter-head



.2 sheetsl-sheet 1*: C. L. GOEHRING.

ROTARY GUTTER HEAD.

Patented Jan. 27,1891.

gygy@ (No Model.)

illniTT. STATES PATENT @ittica CHARLES L. GOEHRING, OF YALLEGHENY, PENNSYLVANIA.

ROTARY CUTTER-HEAD.

SPECIFICATION forming part of Letters Patent No. 445,335, dated January 27', 1891.

Application tiled April 19, 1890. Serial No. 348,724. (No model.)

.T0 all whom, t may concer/1.:

Be it known that I, CHARLES L. GOEHRING, ol' Allegheny, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Rotary Cutter-llcads for fiiolding and Planing Machines; and l do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, lForming a part of this speci fication, and to the letters ot' reference marked thereon.

This invention relates to a new and improved cutter-head designed more especially for use in connection with molding-machine cutters, although applicable to other similar uses; and it consists in the novel and improved eonstruction, combination, and arrangei'nents of parts, as hereinafter fully described, and pointed out in the claims.

In the drawings, Figure l is a side elevation, and Fig. 2 a front or edge elevation, of the improved cutter-head. Fig. is a longitudinal section on the line a: .1', Fig. l, and Fig. 4; is a sinnlar section on line y y, Fig. 2. Fig. 5 is a transverse sectional view on line .e s, Fig. l. Figs. 6 and 7 are side and front views, respectively, of the sections of the head detached and separated. Fig. 8 is a transverse sectional view of the head with cutters in position.

Similar letters of reference in the several figures indicate the saine parts.

The improved cutter-head is formed in two sections A B, movable longitudinally the one upon the other and provided with a central orifice for the accommodation ot the shaft or spindle to which the cutter-head is to be applied. The principal section A is formed or provided with a tubular extension a, fitted to receive the other section B, the latter properly guided, as by pins b, to move longitudinally upon tubular extension d, while a nut C or equivalent clamping or adjusting devices is applied to the outer end of the tubular extension d and operates upon the section l to force and hold the two together. The opposite sides ot the sections have arc-shaped faces n. Zi', and one or both sections (preferably both) are reduced on lines parallel with the curved faces d Zi', the shoulders a2 b2 thus formed being undercut or inclined substantially as shown, thus producing, when the sections are associated together, an undercut or dovet-ail groove.

The knives or bits D used with the cutterhead are are-shaped and furnished on their inner faces with dovetails or ribs (Lsuited to be engaged and clamped within thc groove formed between shoulders a2 Z22.

XYhen a cutter or bit is to be inserted, the nut or fastening device is retracted and the rib on the arc-shaped bit is entered between the shoulders d2 U3 on the two sections A B, and the bit is then slid to place, with its cutting-edge projecting beyond the circumference of the head. The nut is then tight-- ened up, thereby not only clamping the rib'd between the shoulders o2 b2, but at the same time pressing the bit firmly against the face of the head, said face being cut to the arc of the inner face of thc bit and extending to or beyond the sides of the bit, thus forming an extended bearing-surface against which the bit rests and is clampcd and held.

By mounting the section B to slide longit-udinally upon the tubular extension of section A two important advantages are gained. In the first place, the cutter-head and cutters can be adjusted and fixed before being applied to the shaft or spindle and can be adjusted as a whole upon the spindle, and, in the second place, a long and large bearing or guide is formed for the movable section B upon the section A, one which will obviate tilting and cramping when moving.the section B to release or clamp the bits and will insure the proper support for the latter when applied. The interlocking projections or pins l) serve, principally, to guide the sections and prevent the rotation of the one upon or with reference to the other, and other equivalent devices may be used or substituted for this purpose.

As the bits become worn or are ground off they are shifted upon their seats to bring the cutting-edge at the desired distance from the center of the head, and tlie same cutters or bits can be employed upon heads of different dimensions and tor cutting in larger or smaller circles by forming the bearing-faces of the heads with the same 'curvature as the inner faces of the bits.

The cutter-head shown is of relatively small dimensions, and-it is for the smaller sizes IOO that the present. invention is most advantageously employed, dispensing' with the clamping-screws heretofore used tor holding the bits in place, and at the same time providinggl ample support and bearing for retaining the bits securely in place and preventing springing or displacement when in action.

Having` thus described my invention, what I claim as new isl. The improved cutter-head herein described,comprising` two sections movable the one longitudinally of the other and guided upon a tubular extension thereof, each section being furnished with undercut shoulders and exterior bearing-faces for the reception of the bits, substantially as described.

2. The combination, with the head or section A, provided with exterior curved faces and an undercut shoulder, of the section B, guided to move toward section A and provided witlreXterior curved faces and a corresponding undercut shoulder, and means for clamping' the two sections together and upon the rib formed on the back of a curved bit, substantiall y as described.

The hereinbefore -described improved cutter-head, comprising` the section A, formed with tub ular extension,exterior bearing-faces, and an undercut shoulder, the section B, litted to the tubular extension of section A and provided with exterior bearing-surfaces and undercut shoulders, and bits provided with a dovetailed rib extending longitudinally thereof and adapted to be received between the undercut shoulders on sections A B and having the faces on opposite sides of said rib litted to and resting in contact with the eXterior bearing-faces of the sections A B, substantially as described.

4. The hereinbetore described improved cutter-head, composed, essentially, of two sections A B, provided with exterior curved bearing-faces conforming substantially to the curved inner face of the bit, with intermediate undercut shoulders t'orminp` a dovetail groove, one of said sections being` guided to move longitudinally upon the other and provided with interlocking` portions to prevent rotation, substantially as described. Y

5. In a cutter-head such as described, the combination of the section A, having` arcshaped surfaces or sides d and undercut Shoulders d2 and provided with a tubular eX- tension d, the section B, `fitted to slide upon tubular extension d and provided with arcshapedsurfaces b and undercut shoulders b2, the pins engaging the sections to prevent rotation, the nutv applied to the tubular eX- tension and engagingT movable section B,and the curved hit provided with narrower dovetailed ribs fitted and clamped between shoulders d2 b2, substantially as described.

CHARLES L. GOEHRING. Vitnesses:

JOHN GLENN, J. R. MURPHY. 

